Sanding block construction



Jan. 27, 1953 R. G. THOMPSON 2,626,489-

SANDING BLOCK CONSTRUCTIQN Filed June 19, 1948 .F/QZ jiaflm @Mm-Euv2Patented Jan. 27, 1953 UNITED STATES PATENT OFFICE 2,626,489 SANDINGBLOCK CONSTRUCTION Richard G. Thompson, Stillwater, Minn. 1 ApplicationJune 19, 1948, Serial No. 34,032

4 Claims. (Cl. 51-186) My invention relates to an improvement in sandpaper block and deals particularly with a support for sheets of sandpaper for use in sanding operations.

' In the smoothing of various objects with sand paper, it is usuallydesirable that the paper he held on a flat plane during use. Variousdevices have been supplied for clamping sheets of sand paper to a blockor similar support. These means have usually been costly to manufactureor unhandy to use. Furthermore, such devices usually require sand papersheets of a, predetermined size and shape and it is necessary to cut thesand paper to proper shape before the same can be used.

The object of the present invention lies in the provision of a supportfor sheets of sand paper or similar abrasive material which can beproduced at low cost and which supports a series of sheets of sandpaper. When a sheet of sand paper has become worn this sheet may bereadily removed and the next adjacent layer of sand paper used. When allof the sand paper of the block has been used, the block may be discardedand a new block used.

A feature of the present invention lies in the provision of a sandingblock having a substantial supply of sand paper thereon, the sheets ofwhich may be consecutively used and the block discarded after use. Theuser need only remove the sheets from the support when the sheets havebecome worn.

An added feature of the present invention lies in the provision of anelongated block having substantially parallel ends and in securing thesand paper sheets to the block by bending the sheets about the cornersof the block between the bottom surface and the ends and adhering thesheets along the end walls of the block. As a result the adhesive usedin securing the sheets together does not damage the. portion of the sandpaper to be used and the bending of the sheets about the corner providesan effective means of anchoring the sheets in place.

An added feature of the present invention lies in the provision of aplurality of superposed sheets of abrasive material secured togetheralong lines of adhesive which may be spaced from one edge of the sheets.The projecting edges of the sheets thus project beyond the adhesive andpref erably beyond the adjacent portion of th block so that theindividual sheets may be readily grasped by the fingers for removing thesame.

An added feature of the present invention lies in the provision of asanding block which may if desired be provided on opposite surfaces withsand paper of different particle size. A- relatively course sand paperor abrasive sheet may be applied to one surface'of the block and a finersand paper may be attached to the opposite side, thus making the blockuseful for many purposes and permitting a rough sanding operation and asmooth sanding operation'to be accomplished with the same device.

An added feature of the present invention lies in the fact that thesurfaces on opposite sides of the block, may, if desired be off-set onefrom the other so that the'free unattached ends of the sand paper sheetsmay be readily accessible. This is accomplished by either notchingopposite ends of the block on opposite surfaces thereof or else byattaching two blocks together in off-set rela tion'.

These and other objects and'novel features of my invention will be moreclearly and fully set forth in the following specification and claims.

In the drawings forming a, part of my specification:

Figure 1 is a perspective view'of my sanding block showing theconstructionthereof.

Figure 2 is a side elevational View of the same. 7 The block A isextremely simple in construction. The block includes/an elongated blockbody 10 of suitable" size or dimensions. The block'lfl is provided withopposed parallel surfaces l l and I2; One end l3 of the block l0 isnotched as indicated at M. The notch l4 communicates both with the endl3 of the block and also the surface I2 thereof and in effect forms aprojecting lip I5 adjoining the block surface H which projects beyondthe opposite surface l2 of the block.

A similar shoulder I6 is formed in the diagonally opposite corner of theblock at the junc ture between the end wall I! and the block surface II.-'This notch l6 shortens the surface II and forms aprojecting lip l9adjacent the block surface 7 I2. Thus a step is provided atopposite endsof the block for a purpose which will be later described in detail.

In the foregoing description, I have described the block It) as beingformed of a single piece of material. The same construction may beeasily produced by attaching together two blocks of onehalf thethickness of the block l0. Such a construction is illustrated in Figure2 of the drawings, the block it being shown composed of two blocks 20and 2| which are off-set one from the other to form the projecting lipsl5 and I9.

The transverse juncture between the surface II and the end wall [3 isrounded as indicated at 22 and the juncture between the surface H andthe wall 23 of the notch I6 is similarly rounded as indicated at 24. Thejuncture between the end wall I! and the block surface 12 is alsorounded as indicated at 25 and the juncture between the surface l2 andthe wall 26 of the notch I4 is also rounded as indicated at 21.

A series of sheets of sand paper or other suitable material indicated bythe numeral 29 overlie the surface I l of the block I 0. One end 30 ofthe innermost sheet of the series is adhered to'the wall 23 of the blockby adhesive 38. The strip of adhesive is provided at the extremity ofthe sheet and adheres the innermost sheet to thesblock.

The next layer of material is adhered by a'simi body having a'pair ofparallel bearing surfaces, a

lar strip 38 of adhesive to the innermost sheet. 7

and similarly the ends 30 of all of adhered to each other.

The other ends 3! of the sheets 29 are adhered by a strip of adhesive 32to the end wall l3 of the block, and the next, successive sheets areadhered to each other by similar strips of ad hesive. The "adhesivestrips 32 arespaced from the extremities 3| of the sheet so that'a freeunadhered end preferably extends beyond the notched wall I 3 asindicated in .the drawings; Theend 3| of each sheet may be engaged'bythe fingers and the outermost sheet may be readily stripped from theremaining sheets as indicated by the curved outermost sheet illustratedin the drawings. In a similar manner a seriesof superposed sheets 33 ofsand paper or other suitable material overlie the block surface l2, oneend 34 of each sheet. extending over" the curved juncture 21 andoverlying the end wall 26. A strip' of adhesive 35 is provided betweeneach sheet and the next lower sheet and also between the innermost sheetand the wall 26. Thus one end 34 of each sheet is anchored firmly totheblock.

The other ends 36 of the sheets 33 are folded about the rounded juncture25 to overlie theend wall I! of the block. "Strips of adhesive131 areinterposed between the various sheets and between the'innermost sheetand the block end wall IT. The strips of adhesive 31 are spaced "fromthe ends of these sheets so that theend's project beyond the adhesiveand'rnay be 'i'ndividually grasped by the fingers. Theoutermostsheet'may accordingly be readilf'gra's'ped and separated from theremaining sheets'when the outermost sheet becomes w'orn. i It will beseen that the'adhesive securing'the various sheets in place is at theends of the block so that the sheets fold about the corners joining theblock ends to the'block surface' 'As a result a longitudinal pull uponthe sheet must be trans mitted about the corner of the block, therebypermitting the outer strip of adhesive to'holdrthe sheet in place.Furthermore, after the 'sheets have been withdrawn the portion of theoverlying sheets having adhesive thereon is at the end of the blockwhere it does not contact the surface being sanded.

the sheets are the spirit of my invention.

. I claim:

1; A sand paper block including an elongated lip projecting from eachend of said body, one of 7 said lips being flush with one surface of thebody and the other being flush with the opposite sur- If it is desiredthe innermost sand paper layer face of the body, a series of abrasivesheets overlying each of said body surfaces, the sheets of each serieshaving one end abutting one' of said lips and extending over the end ofthe other of said lips.

2. The structure described in claim land including strips of adhesivesecuring, the sheets of each series together, the adhesive strips beingsolely located outwardly of the ends of theblock. f 3. The structuredescribed in claiml in which the sheets extend beyond the lips andadhesive strips secure the sheets together said adhesive strips lyingsolely outwardly of the ends of the block.

4. A sand paper block including an elongated body having parallelopposed bearing surfaces and walls connecting said surfaces, a series ofsheets of abrasive -material overlying one of said bearing surfaces, theends of the sheetsbeing curved to overlie portions of 'the' walls of theblock, a second series of sheets overlying the opposite' bearingsurface, the ends of the second series of sheets being bent to overlieportions of the walls of the block, and strips of adhesive lying solelyoutwardly of the walls of the block and securing the sheets together.

. RICHARD G. THOMPSON.

, REFERENCES CITED IThe following references are of record inithe fileof this patent:

UN ITED. STATES PATENTS

